How do I get rid of this error? It has occurred after updating spsimpleportfolio. I have PHP version 5.4

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PHP

Joomla

Parse error: syntax error, unexpected ':', expecting ';' or '{' in C:\xampp\htdocs\akadaulo\components\com_spsimpleportfolio\router.php on line 88


private function getAlias(string $id, string $table) : string
{
try
{
$this->queryBuilder->clear();
$this->queryBuilder->select('alias')
->from($this->db->quoteName($table))
->where($this->db->quoteName('id') . ' = ' . (int) $id);
$this->db->setQuery($this->queryBuilder);

return (string) $this->db->loadResult();
}
catch (Exception $e)
{
echo $e->getMessage();

return '';
}
}

What I have tried:

I have checked the php code in the component, but i don't have a clue how to correct it